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Old 01-10-2011, 07:41 PM   #1
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Excessive Drivetrain Torque

Hi Everyone,

I am hoping to nip a problem in the bud. This summer I bought a '01 TJ Sahara AT. Wanted a manual transmission, but had to settle with the three speed.

Anyway, the Jeep is great (after a few unrelated repairs), but when I shift into drive with my foot on the brake, I get an incredible amount of torque out of the drivetrain. The front of the Jeep lunges down and it takes a good amount of pressure on the brakes to remain stationary. Normal braking at speed does not seem to be a problem, though when slowing to a stop, more than a normal amount of pressure is required. Shifting from drive to park releases the drivetrain torque and returns the Jeep to a normal stance. Idle remains normal, everything else is in good shape.

Any help would be great. Thanks for taking a look!

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Old 01-10-2011, 07:43 PM   #2
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new pads maybe. could be worn brakes.
is your idle fine?
hows the condition of the transmission fluid?

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Old 01-10-2011, 07:48 PM   #3
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Brakes, booster, and MC are in good shape. I assume that if it were a brake issue I would have trouble staying where I am... instead I just get an incredible amount of body travel shifting into gear.

Good question about the tranny fluid. When I bought it from the guy he had the transmission serviced, with a filter replacement, but I havent checked since. It had this strange issue back then, too.

Thanks for the help.
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Old 01-10-2011, 08:30 PM   #4
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Assuming correct idle, etc., this behavior seems more or less normal to me, especially if it is stock tires/3.73 gears (or similar, net gearing). Stock tires and 3.07 gearing won't evidence this behavior nearly as much.
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Old 01-10-2011, 08:39 PM   #5
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Automatic transmissions generate 2-3X more low-end torque so if your idle is even a little high from something like a vacuum leak, I can see this happening.

Or the transmission's kick-down cable might have been adjusted too tight next to the throttle body. It should only be tight enough for the cable to have zero slack in it at idle.

Don't feel like you have a bad choice of transmissions however. Your 3-speed 32RH automatic transmission is one of the best and most bulletproof transmissions to have ever come out of Detroit. Ford even tried to buy the manufacturing rights to it but Chrysler wanted too much $$$ for Ford to agree to it.

I actually converted my last TJ from its OE 5-speed transmission to that very same transmission several years ago. It does much better on extreme-level trails due to its added low-end torque and infinitely low first gear ratio that also provides an infinitely high crawl ratio.
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Old 01-10-2011, 09:07 PM   #6
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Thanks Jerry. I've never driven one of these AT's before, familiar only with the Manual in my former 01 TJ. Something just feels off about it, and it is literally tiring to stay stopped... I am going to look into the kick-down cable and then try to find someone else around here with an AT.

The only... ONLY thing bad about this transmission is the 3K RPM at 75mph...

Thanks for the help.
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Old 01-10-2011, 11:24 PM   #7
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Quote:
Originally Posted by soundsout View Post
The only... ONLY thing bad about this transmission is the 3K RPM at 75mph...
The engine is fine with those rpms and you will be too with them after a while. I had 35" tires and 4.88 gears with mine so mine was turning 3K at either (I forget) 65 or possibly 70. That Jeep was stolen earlier this year so I don't recall its exact rpms but they were higher than yours.

So don't sweat the 3K rpms, the old 4.0L can run forever at that or even higher rpms.

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